Double wall mug



FIG. 1 is a perspective view of the double wall mug showing my new design.

FIG. 2 is a left side view of the double wall mug of FIG. 1, the right side being identical.

FIG. 3 is a front view of the double wall mug of FIG. 1.

FIG. 4 is a rear view of the double wall mug of FIG. 1.

FIG. 5 is a top view of the double wall mug of FIG. 1; and,

FIG. 6 is a bottom view of the double wall mug of FIG. 1. 

The ornamental design for a double wall mug, as shown and described. 